. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 23.—Wing of Eupetomena macroura. Although the shafts of the primaries are always hard and strong, to enable them to endure the rapid vibrations to which they are subjected during flight, they are not often conspicuous for their unusual thick-. Fig. 24.—Wing of Aphantochroa drrhoehloris. ness. In some genera, however, they are thus extraordinarily devel- oped, in Sphenoproctus and some species of Campylopterus, for example, appearing al
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 23.—Wing of Eupetomena macroura. Although the shafts of the primaries are always hard and strong, to enable them to endure the rapid vibrations to which they are subjected during flight, they are not often conspicuous for their unusual thick-. Fig. 24.—Wing of Aphantochroa drrhoehloris. ness. In some genera, however, they are thus extraordinarily devel- oped, in Sphenoproctus and some species of Campylopterus, for example, appearing almost like a monstrosity or abnormal swelliug, as shown Fig. 25.—Outer primary of a species of Campylopterus, showing thickened shaft. in (Figs. 22 and 25), which is accompanied by others (Figs. 23 and 24) to show the gradual transition through which this excessive develop- ment is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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